You're saying you earned MORE money during the problem with the ?fb_xd fragment? in what you described as a 'golden period'.
This is not a good thing, trust me, in fact if you do not get it sorted out, i.e. stopped, you are either going to be smart priced back to the stone age or your account suspended ...
@Atomic ... The I.E. 8 bug does not just show a blank page, it CAN also refresh the page (and the adverts on it) hundreds of times per unique visitor, (if they cause the bug to activate - and particularly when they hit refresh a few times on seeing a blank page).
I was alerted to this by one of my team who saw this on my site for two days before we acted quickly to stop the problem - I also checked it out using a computer using I.E.8 (one that activated the problem, not all I.E.8 browsers do, I estimated it at around 1 in 50 visitors with I.E.8) to see exactly how the page was viewed. The problem also came out of the blue, I had used the 'like' button previous to this for months.
An unintended consequence of this problem can see the page impressions (and your adsense impressions) multiply a thousand fold with just 10 or so visitors; I found 12 visitors to a page could record it as being seen 800 times etc. all with the ?fb_xd fragment attached to the url. Page Impressions in adsense also reflected this increase for the two days it was happening on my site, ads were being reported as being shown in correlation with the increased ?fb_xd fragment, an increase of thousands of impressions (not good!) with no CTR.
---- The image given as a link by the OP shows this happening, the page given as an example is being registered as being seen 31,800 times from just 4331 unique visitors, (i.e. each person on average wants to see this same page about 10 times, for just 12 seconds?) therefore something is wrong ... particularly when adsense also says this page displayed ads 31,800 times, especially if CPM ads are being shown (which register as needing to be paid) and not CPC ads ----
It also has a knock on effect of throwing out your analytics by a huge factor, page impressions appear 90% improved, while bounce rate appears reduced by 90% and time on site is reduced by 90% etc. (Remove the fragment from being identified by analytics and under webmaster tools as a legitimate url)
There is nothing that is good in allowing this problem to fester and do nothing about ... The only way you would earn more money is if you were showing CPM ads and each 'fake' view (totalling in the thousands) were being recorded as 'natural' - and this would only last for a small period of time before your account was suspended - because a closer examination by adsense at the end of the month would show each view of the page only lasts a fraction of a second.
The best way to stop it cold is to add this to your .htaccess file ...
#Facebook Redirect For Added String
RewriteCond %{QUERY_STRING} ^fb_xd_fragment=.*$
RewriteRule ^(.*)$ http://yourwebsitename.com\/$1? [R=301,L]
My advice to anyone who see the ?fb_xd fragment get attached to their urls because of using the 'like' button etc. it to sort it out, and quick, before it does damage to your analytics, your direct advertiser stats and perhaps your adsense account.